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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab55bb24dbfc6f1603f5b1452fd474b745a644414670746962ef982f77207aa8' 
  AND token = 'ooEfIxGhuAS8kvRs2AkJxC8saPG/D8/dGg3Go82N6Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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