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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f29a90afa8af723c3c661befc7c5903a857cb0acec20806eb1257d8a4a98c8' 
  AND token = 'JL6oJHNt5Oj5WivyEhT50M6X7sV1A0/LAB1rrBx4YmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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