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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93a59a5229976836f3d617ad531e6acd5bd47d1d5812e196024b1fc480e99fe' 
  AND token = 'c+2ZOzytT4KUPGVV0WlNAvsUnDL1zFB6IT8n3utmIWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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