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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05707963144b1632c0452074a4bb6a0ff359c235f424b64b8df7bb1075ced55' 
  AND token = 'GniK+pTzUsjmLItKotxsm3YZEsyjUZQC9xt5SE+2b/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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