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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07ccf41a8272f50fadd73b27cdafc13449ad0a25ae0fc14b1980c8c0bed8c4d' 
  AND token = 'x+2URbnmKG/0WC07rbj7J8xOw1thxwSTMKSXz/TUH3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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