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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951f805a075f9c37afcc7b323b1d053bf282f8e95b6ef1714d182d54fbdac2a9' 
  AND token = 'TxQt8pLmhdLEhttDNklBcWr88YQlB5OW5l8atp5JWQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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