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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86443b4161c2cf169c6ac7f098d8cc31c430e46f61de2e3e2cf39ec1c9fe9d96' 
  AND token = 'eSxvbbxyfknXmgG7dQSnSJrA2bfMOKMl64cT1k3C3fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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