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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62043b78c67923304fa7c147bd4f88a078591c2d4deb007b59f9e02eed844878' 
  AND token = 'NPqlGiGxK6DR6QO9NvkaG2ia2tnGBiP9NSgC4waOuBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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