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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27464ae209f2c3c0a9f9854a324e48ffea60c9b55ba2f6cf2af6185b37ca159' 
  AND token = 'rdzqBxygYXi8regbOHUL54JF2hQea4jWeeuNRq0WDWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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