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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2c0f0cb16ddbebda79454b6665251f5e93bcd60ea0b400696cca50a546c76e' 
  AND token = '6u/Hza+HRSqBP3mmZDS9+2Nhz5djEod0Gz+DXHvcRfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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