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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef5b9885155716abac39f54ea9d51958a2ce09fbd238b258def68df4edcfda1' 
  AND token = 'jYMj4QY9X2G8Y8764efXD6LQ8yEBMzN91FSV7cElHeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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