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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c5bb4ec3ef1c7372efdc0981fdaabee6684705e84d5ed90a7f408d85d9fd46' 
  AND token = '44r1evljphx5o+1ap8T5h4VlAo3BSFS67e9iHBxdT44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00148

JSON explain

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