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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a557f2e17374cfbf8b077145fc18cba8d45ff86581d6765f554695cb5d8d1b3' 
  AND token = '/5C6odd3Na7QwloxQmaX/jxekSnEOp2RLWmC6SItHIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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