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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa5f939746a88c0acdb841896e4ef1653023e996eead37dbda72f172dfb4c89' 
  AND token = 'NxYu04EfMHE4WGIGlqL46q4pb+oWsrcsWFKp4K1/n8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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