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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19922e09db126791740fbfaf230cf73d8839a83c06548e4f146bae12abdaf01' 
  AND token = 'Noir1SwX/evI9UP4lZ3pi2tZ4idgj5TIa+j93hpGk/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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