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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9c22a30b1bcc9aee1a3213c3cbbd8d72a3fe5814d51b57bf81328460e6ffeb' 
  AND token = '/A1qY9wnH/oD1vS0mQ30L470qXkZMvsvtyHs0ygdWx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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