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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeeed9d62ee6866a1d017a1931a4c492407ad460a78a5517fbfbf6611a67c79d' 
  AND token = 'If9aBgkpjmwdY9wrYq+AuztzGXNl2Uq/b7tbOTDc3fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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