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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d424a2c813eb7e777713ef21f05c88239c5c2783af7c89242d1888c4cda488' 
  AND token = 'dNbkvYNTA7YKTpF+AcRQRgQAIt23tzjsr7wuTE+VwgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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