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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c44d2b956741d5b6e598b8c9b2d269f0309c2eec3a5d47170c2d27d68ac916b' 
  AND token = 'In4Vxb/JK7WiW7vvT01adK6L+Nmiy2dZMRKXVrvvWr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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