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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684807f29c2d5779f5751ea7a3a48e48d6f632595fb9054bc8fa7d749ad8e1ac' 
  AND token = 'bLZrutkYdG8doRolqeoRxznJgcb1KnU8kdKe0vHLxvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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