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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d98f9fa89e8f0c695f3aa3914e7c7e387f740c2eeb7dfeea0d2d89a7d097f48' 
  AND token = 'q1grW44dUmI9d+7knCq2aoshza4aRUK1QtBjthSEPuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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