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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefda70091b198e93c27fb1c340ddd81b282c58a01e9a7f7e7fd59ca53b2fa7f' 
  AND token = 'vYjf4VpwKQNcGbZGqkEuiNjSMih4DbkzvNt1txVxVKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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