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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c98ad2ae9fc2b1374cd5cf53652cd891b8e80133927831b11fabb5eb5ab93d' 
  AND token = '/H5utIPvBDF1VafvQnmP1kS3M+SeJFasTxchQOCSLcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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