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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bacd08cb8428dc3836190dc0822f56e6a56688f8dba58ef2b4ac3a4c50b4e39' 
  AND token = '/s4XEM3d+lC1dcQ2FKxPKZivZ7U3MYQgON2enPhrfKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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