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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb57c71865d55a0cbd773f3c971522bdf8435af034ce3caa82e711623004901' 
  AND token = 'zV1SimnsFqzEaYqjlLm70hE9V5nO/OO2haakp2BbXG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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