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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d44db79577d4a4251eeba76b6a62782702e021da8314c9b1a4a06790278c743' 
  AND token = '/BP80X6ylOkdT5IDmwMqXEaacqX9Jl7LpCvAFQPtGog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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