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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9d34ff5cdd452fe2fee75ec3a96b3c9af7d8484911004b39497a2c016b4fee' 
  AND token = 'OSMGITDTs5VRwLyvj834kEQYsM6lkzJRwgcvD2SNNS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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