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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89805c5253d31ad31b36e7cfcc05c7bf90ff6c0e58298dbd706f5b743164b007' 
  AND token = 'rRdPvB4k54Ph4GqXGtZRbURo/vBkTg1XBtnDDtl/SOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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