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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c200027bd0685104a6bfe072f6e62b1c4b12c9a349aae85c821bdaf0de3f787' 
  AND token = 'VvhBBxyk93MCEF52W2kcHfCwVI0iNH2rxcFYzbRG8cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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