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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bde7c4f36d42df2deac254388693be5b98dc407a98ebbfa039208acc14cd21' 
  AND token = 'N4EI62/jd1/tAbKOQJPWQxnc3fftwihHTXtEZfH9OEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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