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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef2127886754d1ee3a35fb31473ab33e82e7d0d497dfe9da9ee0c2ea8d7a8d2' 
  AND token = 'tOUZb8Dg/2v9a1q9yxYp7ctGajHh5DnenENTVofnxrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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