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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b0c8993592c4bd2c2c151c94939c27a2231bc2f60fce98ae43e805332eba3d' 
  AND token = 'X9mz3N+FKXlSNDKDkmu99X3gX5TWvdHRngzLWKgnNUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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