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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3012614426e6ec8f0e2ba179ebf891d77e4fd9cdbe483b5b162a1c55d421a11c' 
  AND token = '2AzvkaFrq2IAA363NSY5x4YrofJ/piIect6hJvCs4TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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