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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1d925cf4defce605f17afb2f113c416b4a7f7f37fa396c099f5eb1724502ae' 
  AND token = '7faGO4GKSj61b8LOGR1aY2K9v3FdMLMoXxN4Oj6ANoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}