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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b4c718bc01d5081e5d97d08922a0fd6303e39688894e12217006698f935c77' 
  AND token = 'hva/xhbAxWGUMoGcSNaFM5foYq80dNo3fcfHq31jJM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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