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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64a82427f843cc907e4daceb98677e72c37c0126c9add049d5066e088101eb3' 
  AND token = 'g5fQ3bRDb0ekqvObWZCZfrG7l+PHblvRu3pCCenssZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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