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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38c387e41ac3e3129a382bd255366720e15bb94627f0e6b803e9e517d65a744' 
  AND token = 'BEwzXyvub2Nhlt7U7ebxBww2Reu7rmiNiY3dbRrlY8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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