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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efaf6f9d4ba89f74161c1e2d10f3b1e864cc4ab88d490ada3fa8370f523884f' 
  AND token = '7Ts+DJAt0ENKW6JauVbSMVbuNZqqhAUny+r6j9fSQ3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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