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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8cc73c2e4965df2eb2cd388321edd0fc20e061ff3ed5093b0b2102c5fc9680' 
  AND token = '7YeR97bVu1D22LOMdluGOULMKe4niWSCAVOHW90WuVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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