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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7a727709736111ed9dcfe5913c2ba27c8995429865b1d99f2fde35bd093b43' 
  AND token = 'zhtlP6hYi9stfln5xmMB65O4BanYCHGcjvRcf4BQdKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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