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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3473e21013fa7067f5b7cc48ba16fa55686980abb75a364d64313153d1021e22' 
  AND token = 'bjzflct59ziF1wJkCRrxpdr2uJK9Plisu4WQNiw/3bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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