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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd680370e05e90de2ca7793e47cfaa0d26a80c8da465dcda6fc28588e87565b3' 
  AND token = 'Cvi5Rp/b51fsHWKIOkC52JhJ/mpIe1DXFHDNWEW/LEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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