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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a54a02a50647a2024e7f3ace21ade36f9ef576ae3c9959f2c37819744471b6' 
  AND token = 'Cyum3Tbgk5RQj7iswZWw8wbugNgBTaI058kZuboIsvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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