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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca63f8705a4fbb4b8d02b82954cc9dd61ce5c9c7580d3a3d6dcb73669b5eae11' 
  AND token = 'wXYJN3nal2KXIFaQ6+utzKPMaAA+6MI4NsiSmH1C4bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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