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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df890113a1b9a0e11030a17e82264d2a86659b865ba3e882d1bdb976a7e9c0c' 
  AND token = '6oLoHekKWQLewPuW0HnepPgRlHbln6pUTcmjQzKOPwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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