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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2020fb324b679bb16baecabcd570d4f6902bfcc69002fd8a11e41d48cef770a6' 
  AND token = 'BOseyNyo8JNZqSOeY1abbGNwtMCgs8D9GdyZ05dpaqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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