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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfaafd005f48acaa1e95e4d2de53990ce9cc786fdddef6efc68dff6765ecbf5' 
  AND token = 'yG4xjmNa+/X9HEUE7wvB/cHnHn3tHRq6PsX+NDNT60g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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