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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a3c38ca65a70759344130135ef0e601ddd0d6cbad1d375f3e28dcbd36cf6b4' 
  AND token = 'xsJYQGEFkMEnf2hyRG0ErzplJcR3TZLOMyxBVic5/x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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