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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d50d3e2ff7f055fbae950aae659f44f34ff0b8142a8eb7e48dcab09a3f12dc' 
  AND token = '+Fh3BkxRGUjMVgY2faNzBxvcJ9TE+OiNNai6FRS4QKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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