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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf9b4cbe9d91d8f882a3d2f2e7cbf6685bb6e3d32aa6f463862b8d8059d665d' 
  AND token = 'b6lyaTblgU69aNulSfVBZM/Xy5K1Xr9Z4ty5PzacYaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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