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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ddf7a80c65727015ea026cd1645e66421efce2c908fba1633536da957f7360' 
  AND token = '5QXKycy+P2Wqb7y+pVwMJwXZt8rlyvIysX1V3Y3DI7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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