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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c063275750288ded6eea2cc066f2656ce94aa3b51fb5ba3c9a7cd55dca0b0c7e' 
  AND token = '/yLBmffhsjT46Cmfv7F7TH4/+lLaXqTlqNbU4Tlfe9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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