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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5a9c3c641d80e970f492dcb9e581670e4168cf78d5deb457e8f576e05713c0' 
  AND token = 'N53Q2vZEJk+NOgCPYHC7Eq30YGHi7UjimR1D/UR1U8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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