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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ce6eb007af5bc433a872c3cb665ddc191a0cdff268e3e7d2e6b504b31c3649' 
  AND token = '4NNon+EzhOkljtvlfksuak3orD7bA108cxuuaHz8BxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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