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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a0caa91bdf4c60dbff75c9b7482dfc9883e5e125f67dbac5f9711d95e31fc7' 
  AND token = 'rxxS+gkmqbcfWdR+vxx27YcTfSGwd7eTHoedPdNWHak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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