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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8706cdda8e584cb43f20b6d1f14c340cc74463a52d8f42b6d77e2722dc05ef65' 
  AND token = 'F5+DLpuVcJQ4wOsioMgd7QRADQlhId9wpETU0SQfboI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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