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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267cca67d4be3c711b581a1b6f7f47c3f0c3501e3575a4d2e624397079edf45a' 
  AND token = 'ZLJxf+KO3ZxdR1SQ96oa809+Rl7894GCBW4gJRUZwvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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