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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d165237bf67ee1faf7a1b522907329b8f22795f3317f41276ebb3206cf36ce' 
  AND token = 'AQVq7hf7VpjjV9Ex7wdL+t4SIAvfE7zzfQMWAeQxm1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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